Cutter-head.



A B. LANDiS.

CUTTER HEAD.

APPLKJATION FILED IIA'R'. 4, I912- RENEWED FEB. 24, 917

Patented A r; 3,1917.

3 SHEETS-SHEET 61 Noun/138 l -l neman A. B. LANDIS.

cungr: HEAD APPLICATION FILED NAR.4|192- RENEWED FEB. 24. 1917.

1,221,193. Patented Apr.3,1917.

3 SHEETS-SHEET 2.

A. B. LANDKS.

CUTTER HEAD.

APPLICATION men MAR. 4, 1912. RENEWFD res. 24. m7.

Patented Apr. 3, 1917.

s SHEETSSHEET a wuww iom BEST AVAILABLE C Op UNITED: STATES PATENT, OFFICE; I

ABRAHAM 1;. tennis, OFTENFIELD, PENNSYIQVAMA.

CUTTER-HEAD.

Specification of Letters Pat nt.

PatentedApr. 3, 19117.

Application filed March 1, 1912, Serial No. 681,413. Renewed February 24, 1917. Serial No. 150,845.

To all whom it may concern:

a citizen of the United States, residing at Enfield, Montgomery county, and State of Pennsylvania, have invented. and discovered certain new and useful Improvements in Cutter-Heads, of which the following is a specification. My said invention consists in certain iinprovements-in the details of construction and arrangement f parts of cutter-heads for cutting threads on bolts, screws, etc., whereby a structure is provided which is compact and rigid and adapted to do work of a fine and accurate character, as will he hereinafter more fully described and claimed.

Referring to the accompanying drawings,

which are made a part hereof and on which similar reference characters indicate siinilar parts,

Figure 1 is a said invention,

Fig. 2 a central section through the same on the dotted line 2-2 in Fi g. 1,

Fig. 3 a detail section on the dotted line Fig. 4a detail View illl'istrating in elevation a feature of construction shown in section in Fig. 3, Fig. 5 a face view of the body of the cutte-r-headstripped of the other mechanism.

Fig. 6 a view of the cutter and cutterholder showing the cu ter in face elevation,

. posite side of the Fig. 7 an-edge view of the same,

Fig. 8 an end view as seen when looking in. the direction indicated hy the arrows on the dotted line 88 in Fig. 7, and

Fig. 9 a separate view of a coiled spring forming a feature of the construction.

In said drawings the portions marked A; represent the body of the cutter-head, B a sleeve for mounting the same on the turret of the machine and Cthe cnt.tei-'-l1older.

The body or hase comprises a casting ha rin a central intersecting T-grooves u in its face. Said grooves run at; right angles with each other, equi-dist'ant front the central aperture. and

which is the axis of the h ad. One end of each grrmve runs tothe outside of the head and the other end cuts into the roorewhi h .(Xtt'IldH atright. angles therewith on the oplnad." ring.\ is nuulnt- 9 ed on the front Ltigt'? of the body by means front elevation of a cutterhead constructed -1n accordance with my pered hollow shank and Formed with the axis oi of a screw-threaded connection, said ring covering the outer open endsot each of said slots. The central hollow shank of said body is circular in form and extends rearwardly within the sleeve B to which it is connected by means of a key I). Said key secures said parts to rotate together but permits an independentlongitudinal movement. A spring -10 is mounted in a perforation 1 formed partly in the sleeve 13 and partlyin theadjacent part of body A and is interposed between a radial pin 11carried in said body A and a pin 12 carried in the sleeve B. The tension of saidspring acts to normally hold body A'rearward against the end ot sleeve B but permits the independent longitudinal movement when rtu' uired. A ring A is also mounted upon body A, its forward edge hearing against the rear face of ring A and its rear end surrounding a disk A to which it is connected by means of a tangential screw 14, mounted to revolve in hearings. in said ring, threads of which engage with a thread in the the periphery of said disk. A collar, is

clamped around the outer end of screw l t by means of a handle 16, having a t screw-thrcaided inner end. -which screws into a perforation in ring cent to said collar and impinges against one side thereof to lock it from rotation. An-

other collar 17 is secured by a pin 18 tothe outer end of saidscrew and turns therewith. The adjacent ends of said collars i5 and17 are provided with lugs 13) and 20, respectively, adapted to strike when said screw is turned, for av purpose to be presently described. A heavytorsional spring 21 is mounted between. disk A and body A, the oppositeends of which arehent at right angles, and rerersely, point 22 engaging with a. perforation in said disk A and the point 23 at the opposite end engaging with a perforation in said body A. The tension of said spring isilireeted to turn the disk A 4 and ring A connected therewith to'open A adja the die, as will l)(- presently described. A I

locking pin 2+ is mounted in collar B and is adapted to engage with a perforation in disk A; when said perforation brouglit to register therewith;-

' The'inncr end of ring A is forn'ied with a series of cam ii an'rs 2t; on its interior, as

host shown in l'ligjlrsaid cams being in transverse position in line with the grooves in the body A.

T he cutter-holders C are formed with sliding,heads C offset from the main body and connected therewith by neck-pieces 0.

Said heads are adapted to be mounted and slide in the groove a in the body A, carry ing the holder 0 and the cutter,- or chaser, mounted thereon a suificient distance from the face of the body for the purposes of the device. The neck pieces 0 project through the narrow part of coves a connecting the holders proper with the sliding heads and forming a unitary structure. Each sliding head C has a projecting arm 0 which lies in the bottom of its groove projccting acrossthe groove on the opposite side at right angles thereto and under the head in said other groove. By this means a long rest and bearing is provided for each head so that said heads may he slid in and out in relation to the axis of the head to adjust the die for wort: of different sizes without weakening the supports or impairing their rigidity. heads C is formed with a perforation in which is mounted a coiled spring 27, the outer end of which projects and bears against the adjacent side of the head C in the groovc extending at right angles with the groove containing the head carrying the spring. Said springs thus tend to slide the several heads outwardly and hold the die normally open. Each one of the several cam faces 26 bears upon a curved face 28 on the end of the appropriate head 6, opposite the perforation c containin the spring so that the turning of ring 1 2 carrying said cam faces in one direction operates to slide said cutter-holders inwardly to close the die, while the turning of said ring in the opposite direction permits the springs 27 to expand and slide said heads outwardly and open said die.

Each cutteD-holder carries a chaser, or cutter, 30 mounted in a suitable recess in the face thereof. Said chaser is adapted to be adjusted by a screw 31 mounted in ;the holder and engaging a screw thread in'the back of said chaser. Each chaser is forined with a dove-tail. shaped shoulder engaging under a correspondingly formed flange 32 in thc face of said holder C and its opposite edge is likewise formed and is encmgcrl by'a correspondingly tapered sliding clamp 3-1. Said clamp is operated by a screw mounted in a screw-threaded perforation in holder C and formed with a conical point which engages with a conical socket in the adjacent side of said clamp. A spring 36 operates said sliding clamp 34 revcrsely to the action of the screw 35 so that when screw 35 is hacked to release said clamp. spring 36 will automatically slide said clamp outwardly and release the cutte'r.

In operation, the parts being in closed position as shown in Fig. 1, the point of Each of said sliding each cutter stands in a radial line with the axis of the cutter-head and thecutting is done by feeding the work thereto. l/Vhen the cutting has proceeded to the point desired, the body A is drawn outward in sleeve B by the action ofthc cutters, as is well understood. until pin 24.- is free from its engagement with plate A. As soon as these parts are released spring 21 expands turning ring A to bring the low portion of the cam faces 26 opposite the high points of the bearing faces 28 permitting springs 27 to expand and open the die, releasing the work. When it is desired to close the die, the operator turns ring A. through the medium of handle 16 which winds up spring 21 and as soonas perforation 25 registers with the end of locking pin 2i, spring'lO enpands throwing said locking pin into said socket and ,the face of .93 against the end of sleeve B, when the dieis closed and the operation may be repeated.

\Vhen it is desired to adjust the die for different sizes of work it may be done by turning screw 14- to carry the ring A? to a ditlcrentposition in relation to the disk A thus shifting .the normal position of the cams 26 and providing for a die of a dirt ferent size.

In operation it is frequently desired to make first a rough out and then a finishing cut on the same work. In such cases the first cut is made and then screw 14: is turned to throw shoulder 20 around into contact with the opposite side or shoulder 19 which will adjust ring 4 to contract the die sufficiently for the finishing out. By this means a finishing cut of accurate and standard adjustment may be secured in all work of the character requiring such finishing cut. I

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. A cutter-head comprising a body formed with grooves in its face extending at right angles to each other and inter secting. cutter-holders formed with beads adapted to be mounted and slide in said grooves, springs interposed between the head in one'groore and the head in another groove at right angles therewith. a ring surrounding said head provided with a se- Pics of cams adapted to bear against the sliding heads opposite to said springs,- mcans for turning said ring to close the die, and means for locking the parts with said (lie in closed position. substantially as set forth. p

. A cutter-head comprising a body formed with ways in its face extending tangcntially and at right angles to each other, those extending in one direction intersecting and crossing those extending in the other direction, cutter-holders mounted to slide insaid Ways, means in said Ways for normally holding said cutter-holders out Wei-(11y, means inoperable relation with each of said putter-holders adaptedto 0pemce them inwardly, and means for lockmg said parts 111 closed position, substantmily as set forth.

3. A cuttenhead comprising :i bedy in said ays; meuns interpqsed beiween said holders fer. normally sliding said holders outward, and means for forcibly Sliding 15 0 them inward, Substantially as set forth.

In witness whereof, I haye hereunteset my hand and seal at Washlngton, District of Columbia, this IGth'day of February, A.

D. nineteen hundred and twelve.

ABRAHAM B. LANDIS. [11.8.] Witnesses:

E. W. BRADFORD, CIIAS.'N. LEONARD. 

